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Given below are four methods $(A-D)$ and theirmodes of action $(i-iv)$ in achieving contraception. Select their correct matching fromthe four options that follow
| Method | Mode of Action |
| $(A)$ The pill | $(i)$ Prevents spermsreaching cervix |
| $(B)$ Condom | $(ii)$ Prevents implantation |
| $(C)$ Vasectomy | $(iii)$ Prevents ovulation |
| $(D)$ Copper $T$ | $(iv)$ Semen contains no sperms |
$A -(iii), B -(iv), C -(i), D -(ii)$
$A -(ii), B -(iii), C -(i), D -(iv)$
$A -(iii), B -(i), C -(iv), D -(ii)$
$A -(iv), B -(i), C -(ii), D -(iii)$
Solution
(c) : Pills also called contraceptive pills contain small doses of either progestogens or progestogen oestrogen combinations. They inhibit ovulation and implantation. Condoms are made of thin rubber/latex sheath used to cover the penis in the male or vagina and cervix in the female just before coitus so that the ejaculated semen is not released in the female reproductive tract, thus preventing sperms reaching cervix. In vasectomy, a small part of the vas deferens is removed or tied up through a small cut on the scrotum, thus blocking gamete (sperm) transport. However semen is a collection of secretions from the seminal vesicles, prostate gland, Cowper’s gland and sperms from testes. So as the sperm is blocked semen is free of sperms. Copper $T$ is an intrauterine device, which is inserted by doctors in the uterus through vagina. The copper ions released by them suppress sperm motility and also make the uterus unstable for implantation.
